/*
 * jpeglib.h
 *
 * Copyright (C) 1991-1998, Thomas G. Lane.
 * Modified 2002-2009 by Guido Vollbeding.
 * Copyright (C) 2009-2011, D. R. Commander.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file defines the application interface for the JPEG library.
 * Most applications using the library need only include this file,
 * and perhaps jerror.h if they want to know the exact error codes.
 */

#ifndef JPEGLIB_H
#define JPEGLIB_H


#include "stdio.h"

/*
 * First we include the configuration files that record how this
 * installation of the JPEG library is set up.  jconfig.h can be
 * generated automatically for many systems.  jmorecfg.h contains
 * manual configuration options that most people need not worry about.
 */

#ifndef JCONFIG_INCLUDED    /* in case jinclude.h already did */

#include "jconfig.h"		/* widely used configuration options */

#endif

#include "jmorecfg.h"		/* seldom changed options */

#ifndef ANDROID
#ifdef __cplusplus
#ifndef DONT_USE_EXTERN_C
extern "C" {
#endif
#endif
#endif


/* Various constants determining the sizes of things.
 * All of these are specified by the JPEG standard, so don't change them
 * if you want to be compatible.
 */

#define DCTSIZE            8    /* The basic DCT block is 8x8 samples */
#define DCTSIZE2        64    /* DCTSIZE squared; # of elements in a block */
#define NUM_QUANT_TBLS      4    /* Quantization tables are numbered 0..3 */
#define NUM_HUFF_TBLS       4    /* Huffman tables are numbered 0..3 */
#define NUM_ARITH_TBLS      16    /* Arith-coding tables are numbered 0..15 */
#define MAX_COMPS_IN_SCAN   4    /* JPEG limit on # of components in one scan */
#define MAX_SAMP_FACTOR     4    /* JPEG limit on sampling factors */
/* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
 * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
 * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
 * to handle it.  We even let you do this from the jconfig.h file.  However,
 * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
 * sometimes emits noncompliant files doesn't mean you should too.
 */
#define C_MAX_BLOCKS_IN_MCU   10 /* compressor's limit on blocks per MCU */
#ifndef D_MAX_BLOCKS_IN_MCU
#define D_MAX_BLOCKS_IN_MCU   10 /* decompressor's limit on blocks per MCU */
#endif


/* Data structures for images (arrays of samples and of DCT coefficients).
 * On 80x86 machines, the image arrays are too big for near pointers,
 * but the pointer arrays can fit in near memory.
 */

typedef JSAMPLE FAR *JSAMPROW;
/* ptr to one image row of pixel samples. */
typedef JSAMPROW *JSAMPARRAY;
/* ptr to some rows (a 2-D sample array) */
typedef JSAMPARRAY *JSAMPIMAGE;
/* a 3-D sample array: top index is color */

typedef JCOEF JBLOCK[DCTSIZE2];
/* one block of coefficients */
typedef JBLOCK FAR *JBLOCKROW;
/* pointer to one row of coefficient blocks */
typedef JBLOCKROW *JBLOCKARRAY;
/* a 2-D array of coefficient blocks */
typedef JBLOCKARRAY *JBLOCKIMAGE;
/* a 3-D array of coefficient blocks */

typedef JCOEF FAR *JCOEFPTR;    /* useful in a couple of places */


/* Types for JPEG compression parameters and working tables. */


/* DCT coefficient quantization tables. */

typedef struct {
    /* This array gives the coefficient quantizers in natural array order
     * (not the zigzag order in which they are stored in a JPEG DQT marker).
     * CAUTION: IJG versions prior to v6a kept this array in zigzag order.
     */
    UINT16 quantval[DCTSIZE2];    /* quantization step for each coefficient */
    /* This field is used only during compression.  It's initialized FALSE when
     * the table is created, and set TRUE when it's been output to the file.
     * You could suppress output of a table by setting this to TRUE.
     * (See jpeg_suppress_tables for an example.)
     */
    boolean sent_table;        /* TRUE when table has been output */
} JQUANT_TBL;


/* Huffman coding tables. */

typedef struct {
    /* These two fields directly represent the contents of a JPEG DHT marker */
    UINT8 bits[17];        /* bits[k] = # of symbols with codes of */
    /* length k bits; bits[0] is unused */
    UINT8 huffval[256];        /* The symbols, in order of incr code length */
    /* This field is used only during compression.  It's initialized FALSE when
     * the table is created, and set TRUE when it's been output to the file.
     * You could suppress output of a table by setting this to TRUE.
     * (See jpeg_suppress_tables for an example.)
     */
    boolean sent_table;        /* TRUE when table has been output */
} JHUFF_TBL;


/* Basic info about one component (color channel). */

typedef struct {
    /* These values are fixed over the whole image. */
    /* For compression, they must be supplied by parameter setup; */
    /* for decompression, they are read from the SOF marker. */
    int component_id;
    /* identifier for this component (0..255) */
    int component_index;
    /* its index in SOF or cinfo->comp_info[] */
    int h_samp_factor;
    /* horizontal sampling factor (1..4) */
    int v_samp_factor;
    /* vertical sampling factor (1..4) */
    int quant_tbl_no;        /* quantization table selector (0..3) */
    /* These values may vary between scans. */
    /* For compression, they must be supplied by parameter setup; */
    /* for decompression, they are read from the SOS marker. */
    /* The decompressor output side may not use these variables. */
    int dc_tbl_no;
    /* DC entropy table selector (0..3) */
    int ac_tbl_no;        /* AC entropy table selector (0..3) */

    /* Remaining fields should be treated as private by applications. */

    /* These values are computed during compression or decompression startup: */
    /* Component's size in DCT blocks.
     * Any dummy blocks added to complete an MCU are not counted; therefore
     * these values do not depend on whether a scan is interleaved or not.
     */
    JDIMENSION width_in_blocks;
    JDIMENSION height_in_blocks;
    /* Size of a DCT block in samples.  Always DCTSIZE for compression.
     * For decompression this is the size of the output from one DCT block,
     * reflecting any scaling we choose to apply during the IDCT step.
     * Values of 1,2,4,8 are likely to be supported.  Note that different
     * components may receive different IDCT scalings.
     */
#if JPEG_LIB_VERSION >= 70
    int DCT_h_scaled_size;
    int DCT_v_scaled_size;
#else
    int DCT_scaled_size;
#endif
    /* The downsampled dimensions are the component's actual, unpadded number
     * of samples at the main buffer (preprocessing/compression interface), thus
     * downsampled_width = ceil(image_width * Hi/Hmax)
     * and similarly for height.  For decompression, IDCT scaling is included, so
     * downsampled_width = ceil(image_width * Hi/Hmax * DCT_[h_]scaled_size/DCTSIZE)
     */
    JDIMENSION downsampled_width;
    /* actual width in samples */
    JDIMENSION downsampled_height; /* actual height in samples */
    /* This flag is used only for decompression.  In cases where some of the
     * components will be ignored (eg grayscale output from YCbCr image),
     * we can skip most computations for the unused components.
     */
    boolean component_needed;    /* do we need the value of this component? */

    /* These values are computed before starting a scan of the component. */
    /* The decompressor output side may not use these variables. */
    int MCU_width;
    /* number of blocks per MCU, horizontally */
    int MCU_height;
    /* number of blocks per MCU, vertically */
    int MCU_blocks;
    /* MCU_width * MCU_height */
    int MCU_sample_width;
    /* MCU width in samples, MCU_width*DCT_[h_]scaled_size */
    int last_col_width;
    /* # of non-dummy blocks across in last MCU */
    int last_row_height;        /* # of non-dummy blocks down in last MCU */

    /* Saved quantization table for component; NULL if none yet saved.
     * See jdinput.c comments about the need for this information.
     * This field is currently used only for decompression.
     */
    JQUANT_TBL *quant_table;

    /* Private per-component storage for DCT or IDCT subsystem. */
    void *dct_table;
} jpeg_component_info;


/* The script for encoding a multiple-scan file is an array of these: */

typedef struct {
    int comps_in_scan;
    /* number of components encoded in this scan */
    int component_index[MAX_COMPS_IN_SCAN];
    /* their SOF/comp_info[] indexes */
    int Ss, Se;
    /* progressive JPEG spectral selection parms */
    int Ah, Al;            /* progressive JPEG successive approx. parms */
} jpeg_scan_info;

/* The decompressor can save APPn and COM markers in a list of these: */

typedef struct jpeg_marker_struct FAR *jpeg_saved_marker_ptr;

struct jpeg_marker_struct {
    jpeg_saved_marker_ptr next;
    /* next in list, or NULL */
    UINT8 marker;
    /* marker code: JPEG_COM, or JPEG_APP0+n */
    unsigned int original_length;
    /* # bytes of data in the file */
    unsigned int data_length;
    /* # bytes of data saved at data[] */
    JOCTET FAR *data;        /* the data contained in the marker */
    /* the marker length word is not counted in data_length or original_length */
};

/* Known color spaces. */

#define JCS_EXTENSIONS 1
#define JCS_ALPHA_EXTENSIONS 1

typedef enum {
    JCS_UNKNOWN, /* error/unspecified */
            JCS_GRAYSCALE, /* monochrome */
            JCS_RGB, /* red/green/blue as specified by the RGB_RED, RGB_GREEN,
				   RGB_BLUE, and RGB_PIXELSIZE macros */
            JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */
            JCS_CMYK, /* C/M/Y/K */
            JCS_YCCK, /* Y/Cb/Cr/K */
            JCS_EXT_RGB, /* red/green/blue */
            JCS_EXT_RGBX, /* red/green/blue/x */
            JCS_EXT_BGR, /* blue/green/red */
            JCS_EXT_BGRX, /* blue/green/red/x */
            JCS_EXT_XBGR, /* x/blue/green/red */
            JCS_EXT_XRGB,        /* x/red/green/blue */
    /* When out_color_space it set to JCS_EXT_RGBX, JCS_EXT_BGRX,
       JCS_EXT_XBGR, or JCS_EXT_XRGB during decompression, the X byte is
       undefined, and in order to ensure the best performance,
       libjpeg-turbo can set that byte to whatever value it wishes.  Use
       the following colorspace constants to ensure that the X byte is set
       to 0xFF, so that it can be interpreted as an opaque alpha
       channel. */
            JCS_EXT_RGBA, /* red/green/blue/alpha */
            JCS_EXT_BGRA, /* blue/green/red/alpha */
            JCS_EXT_ABGR, /* alpha/blue/green/red */
            JCS_EXT_ARGB,        /* alpha/red/green/blue */
#ifdef ANDROID_RGB
    JCS_RGBA_8888, /* red/green/blue/alpha */
            JCS_RGB_565     /* red/green/blue in 565 format */
#endif
} J_COLOR_SPACE;

/* DCT/IDCT algorithm options. */

typedef enum {
    JDCT_ISLOW, /* slow but accurate integer algorithm */
            JDCT_IFAST, /* faster, less accurate integer method */
            JDCT_FLOAT        /* floating-point: accurate, fast on fast HW */
} J_DCT_METHOD;

#ifndef JDCT_DEFAULT        /* may be overridden in jconfig.h */
#define JDCT_DEFAULT  JDCT_ISLOW
#endif
#ifndef JDCT_FASTEST        /* may be overridden in jconfig.h */
#define JDCT_FASTEST  JDCT_IFAST
#endif

/* Dithering options for decompression. */

typedef enum {
    JDITHER_NONE, /* no dithering */
            JDITHER_ORDERED, /* simple ordered dither */
            JDITHER_FS        /* Floyd-Steinberg error diffusion dither */
} J_DITHER_MODE;


/* Common fields between JPEG compression and decompression master structs. */

#define jpeg_common_fields \
  struct jpeg_error_mgr * err;    /* Error handler module */\
  struct jpeg_memory_mgr * mem;    /* Memory manager module */\
  struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\
  void * client_data;        /* Available for use by application */\
  boolean is_decompressor;    /* So common code can tell which is which */\
  int global_state        /* For checking call sequence validity */

/* Routines that are to be used by both halves of the library are declared
 * to receive a pointer to this structure.  There are no actual instances of
 * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
 */
struct jpeg_common_struct {
    jpeg_common_fields;        /* Fields common to both master struct types */
    /* Additional fields follow in an actual jpeg_compress_struct or
     * jpeg_decompress_struct.  All three structs must agree on these
     * initial fields!  (This would be a lot cleaner in C++.)
     */
};

typedef struct jpeg_common_struct *j_common_ptr;
typedef struct jpeg_compress_struct *j_compress_ptr;
typedef struct jpeg_decompress_struct *j_decompress_ptr;


/* Master record for a compression instance */

struct jpeg_compress_struct {
    jpeg_common_fields;        /* Fields shared with jpeg_decompress_struct */

    /* Destination for compressed data */
    struct jpeg_destination_mgr *dest;

    /* Description of source image --- these fields must be filled in by
     * outer application before starting compression.  in_color_space must
     * be correct before you can even call jpeg_set_defaults().
     */

    JDIMENSION image_width;
    /* input image width */
    JDIMENSION image_height;
    /* input image height */
    int input_components;
    /* # of color components in input image */
    J_COLOR_SPACE in_color_space;
    /* colorspace of input image */

    double input_gamma;        /* image gamma of input image */

    /* Compression parameters --- these fields must be set before calling
     * jpeg_start_compress().  We recommend calling jpeg_set_defaults() to
     * initialize everything to reasonable defaults, then changing anything
     * the application specifically wants to change.  That way you won't get
     * burnt when new parameters are added.  Also note that there are several
     * helper routines to simplify changing parameters.
     */

#if JPEG_LIB_VERSION >= 70
    unsigned int scale_num, scale_denom; /* fraction by which to scale image */

    JDIMENSION jpeg_width;	/* scaled JPEG image width */
    JDIMENSION jpeg_height;	/* scaled JPEG image height */
    /* Dimensions of actual JPEG image that will be written to file,
     * derived from input dimensions by scaling factors above.
     * These fields are computed by jpeg_start_compress().
     * You can also use jpeg_calc_jpeg_dimensions() to determine these values
     * in advance of calling jpeg_start_compress().
     */
#endif

    int data_precision;
    /* bits of precision in image data */

    int num_components;
    /* # of color components in JPEG image */
    J_COLOR_SPACE jpeg_color_space;
    /* colorspace of JPEG image */

    jpeg_component_info *comp_info;
    /* comp_info[i] describes component that appears i'th in SOF */

    JQUANT_TBL *quant_tbl_ptrs[NUM_QUANT_TBLS];
#if JPEG_LIB_VERSION >= 70
    int q_scale_factor[NUM_QUANT_TBLS];
#endif
    /* ptrs to coefficient quantization tables, or NULL if not defined,
     * and corresponding scale factors (percentage, initialized 100).
     */

    JHUFF_TBL *dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
    JHUFF_TBL *ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
    /* ptrs to Huffman coding tables, or NULL if not defined */

    UINT8 arith_dc_L[NUM_ARITH_TBLS];
    /* L values for DC arith-coding tables */
    UINT8 arith_dc_U[NUM_ARITH_TBLS];
    /* U values for DC arith-coding tables */
    UINT8 arith_ac_K[NUM_ARITH_TBLS];
    /* Kx values for AC arith-coding tables */

    int num_scans;
    /* # of entries in scan_info array */
    const jpeg_scan_info *scan_info; /* script for multi-scan file, or NULL */
    /* The default value of scan_info is NULL, which causes a single-scan
     * sequential JPEG file to be emitted.  To create a multi-scan file,
     * set num_scans and scan_info to point to an array of scan definitions.
     */

    boolean raw_data_in;
    /* TRUE=caller supplies downsampled data */
    boolean arith_code;
    /* TRUE=arithmetic coding, FALSE=Huffman */
    boolean optimize_coding;
    /* TRUE=optimize entropy encoding parms */
    boolean CCIR601_sampling;    /* TRUE=first samples are cosited */
#if JPEG_LIB_VERSION >= 70
    boolean do_fancy_downsampling; /* TRUE=apply fancy downsampling */
#endif
    int smoothing_factor;
    /* 1..100, or 0 for no input smoothing */
    J_DCT_METHOD dct_method;    /* DCT algorithm selector */

    /* The restart interval can be specified in absolute MCUs by setting
     * restart_interval, or in MCU rows by setting restart_in_rows
     * (in which case the correct restart_interval will be figured
     * for each scan).
     */
    unsigned int restart_interval;
    /* MCUs per restart, or 0 for no restart */
    int restart_in_rows;        /* if > 0, MCU rows per restart interval */

    /* Parameters controlling emission of special markers. */

    boolean write_JFIF_header;
    /* should a JFIF marker be written? */
    UINT8 JFIF_major_version;
    /* What to write for the JFIF version number */
    UINT8 JFIF_minor_version;
    /* These three values are not used by the JPEG code, merely copied */
    /* into the JFIF APP0 marker.  density_unit can be 0 for unknown, */
    /* 1 for dots/inch, or 2 for dots/cm.  Note that the pixel aspect */
    /* ratio is defined by X_density/Y_density even when density_unit=0. */
    UINT8 density_unit;
    /* JFIF code for pixel size units */
    UINT16 X_density;
    /* Horizontal pixel density */
    UINT16 Y_density;
    /* Vertical pixel density */
    boolean write_Adobe_marker;    /* should an Adobe marker be written? */

    /* State variable: index of next scanline to be written to
     * jpeg_write_scanlines().  Application may use this to control its
     * processing loop, e.g., "while (next_scanline < image_height)".
     */

    JDIMENSION next_scanline;    /* 0 .. image_height-1  */

    /* Remaining fields are known throughout compressor, but generally
     * should not be touched by a surrounding application.
     */

    /*
     * These fields are computed during compression startup
     */
    boolean progressive_mode;
    /* TRUE if scan script uses progressive mode */
    int max_h_samp_factor;
    /* largest h_samp_factor */
    int max_v_samp_factor;    /* largest v_samp_factor */

#if JPEG_LIB_VERSION >= 70
    int min_DCT_h_scaled_size;	/* smallest DCT_h_scaled_size of any component */
    int min_DCT_v_scaled_size;	/* smallest DCT_v_scaled_size of any component */
#endif

    JDIMENSION total_iMCU_rows;    /* # of iMCU rows to be input to coef ctlr */
    /* The coefficient controller receives data in units of MCU rows as defined
     * for fully interleaved scans (whether the JPEG file is interleaved or not).
     * There are v_samp_factor * DCTSIZE sample rows of each component in an
     * "iMCU" (interleaved MCU) row.
     */

    /*
     * These fields are valid during any one scan.
     * They describe the components and MCUs actually appearing in the scan.
     */
    int comps_in_scan;
    /* # of JPEG components in this scan */
    jpeg_component_info *cur_comp_info[MAX_COMPS_IN_SCAN];
    /* *cur_comp_info[i] describes component that appears i'th in SOS */

    JDIMENSION MCUs_per_row;
    /* # of MCUs across the image */
    JDIMENSION MCU_rows_in_scan;
    /* # of MCU rows in the image */

    int blocks_in_MCU;
    /* # of DCT blocks per MCU */
    int MCU_membership[C_MAX_BLOCKS_IN_MCU];
    /* MCU_membership[i] is index in cur_comp_info of component owning */
    /* i'th block in an MCU */

    int Ss, Se, Ah, Al;        /* progressive JPEG parameters for scan */

#if JPEG_LIB_VERSION >= 80
    int block_size;		/* the basic DCT block size: 1..16 */
    const int * natural_order;	/* natural-order position array */
    int lim_Se;			/* min( Se, DCTSIZE2-1 ) */
#endif

    /*
     * Links to compression subobjects (methods and private variables of modules)
     */
    struct jpeg_comp_master *master;
    struct jpeg_c_main_controller *main;
    struct jpeg_c_prep_controller *prep;
    struct jpeg_c_coef_controller *coef;
    struct jpeg_marker_writer *marker;
    struct jpeg_color_converter *cconvert;
    struct jpeg_downsampler *downsample;
    struct jpeg_forward_dct *fdct;
    struct jpeg_entropy_encoder *entropy;
    jpeg_scan_info *script_space;
    /* workspace for jpeg_simple_progression */
    int script_space_size;
};


/* Master record for a decompression instance */

struct jpeg_decompress_struct {
    jpeg_common_fields;        /* Fields shared with jpeg_compress_struct */

    /* Source of compressed data */
    struct jpeg_source_mgr *src;

    /* Basic description of image --- filled in by jpeg_read_header(). */
    /* Application may inspect these values to decide how to process image. */

    JDIMENSION original_image_width;
    /* nominal image width (from SOF marker) */
    JDIMENSION image_width;
    /* nominal image width (from SOF marker) */
    JDIMENSION image_height;
    /* nominal image height */
    int num_components;
    /* # of color components in JPEG image */
    J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */

    /* Decompression processing parameters --- these fields must be set before
     * calling jpeg_start_decompress().  Note that jpeg_read_header() initializes
     * them to default values.
     */

    J_COLOR_SPACE out_color_space;
    /* colorspace for output */

    unsigned int scale_num, scale_denom;
    /* fraction by which to scale image */

    double output_gamma;
    /* image gamma wanted in output */

    boolean buffered_image;
    /* TRUE=multiple output passes */
    boolean raw_data_out;
    /* TRUE=downsampled data wanted */

    J_DCT_METHOD dct_method;
    /* IDCT algorithm selector */
    boolean do_fancy_upsampling;
    /* TRUE=apply fancy upsampling */
    boolean do_block_smoothing;
    /* TRUE=apply interblock smoothing */

    boolean quantize_colors;    /* TRUE=colormapped output wanted */
    /* the following are ignored if not quantize_colors: */
    J_DITHER_MODE dither_mode;
    /* type of color dithering to use */
    boolean two_pass_quantize;
    /* TRUE=use two-pass color quantization */
    int desired_number_of_colors;    /* max # colors to use in created colormap */
    /* these are significant only in buffered-image mode: */
    boolean enable_1pass_quant;
    /* enable future use of 1-pass quantizer */
    boolean enable_external_quant;
    /* enable future use of external colormap */
    boolean enable_2pass_quant;    /* enable future use of 2-pass quantizer */

    /* Description of actual output image that will be returned to application.
     * These fields are computed by jpeg_start_decompress().
     * You can also use jpeg_calc_output_dimensions() to determine these values
     * in advance of calling jpeg_start_decompress().
     */

    JDIMENSION output_width;
    /* scaled image width */
    JDIMENSION output_height;
    /* scaled image height */
    int out_color_components;
    /* # of color components in out_color_space */
    int output_components;    /* # of color components returned */
    /* output_components is 1 (a colormap index) when quantizing colors;
     * otherwise it equals out_color_components.
     */
    int rec_outbuf_height;    /* min recommended height of scanline buffer */
    /* If the buffer passed to jpeg_read_scanlines() is less than this many rows
     * high, space and time will be wasted due to unnecessary data copying.
     * Usually rec_outbuf_height will be 1 or 2, at most 4.
     */

    /* When quantizing colors, the output colormap is described by these fields.
     * The application can supply a colormap by setting colormap non-NULL before
     * calling jpeg_start_decompress; otherwise a colormap is created during
     * jpeg_start_decompress or jpeg_start_output.
     * The map has out_color_components rows and actual_number_of_colors columns.
     */
    int actual_number_of_colors;
    /* number of entries in use */
    JSAMPARRAY colormap;        /* The color map as a 2-D pixel array */

    /* State variables: these variables indicate the progress of decompression.
     * The application may examine these but must not modify them.
     */

    /* Row index of next scanline to be read from jpeg_read_scanlines().
     * Application may use this to control its processing loop, e.g.,
     * "while (output_scanline < output_height)".
     */
    JDIMENSION output_scanline;    /* 0 .. output_height-1  */

    /* Current input scan number and number of iMCU rows completed in scan.
     * These indicate the progress of the decompressor input side.
     */
    int input_scan_number;
    /* Number of SOS markers seen so far */
    JDIMENSION input_iMCU_row;    /* Number of iMCU rows completed */

    /* The "output scan number" is the notional scan being displayed by the
     * output side.  The decompressor will not allow output scan/row number
     * to get ahead of input scan/row, but it can fall arbitrarily far behind.
     */
    int output_scan_number;
    /* Nominal scan number being displayed */
    JDIMENSION output_iMCU_row;    /* Number of iMCU rows read */

    /* Current progression status.  coef_bits[c][i] indicates the precision
     * with which component c's DCT coefficient i (in zigzag order) is known.
     * It is -1 when no data has yet been received, otherwise it is the point
     * transform (shift) value for the most recent scan of the coefficient
     * (thus, 0 at completion of the progression).
     * This pointer is NULL when reading a non-progressive file.
     */
    int (*coef_bits)[DCTSIZE2];    /* -1 or current Al value for each coef */

    /* Internal JPEG parameters --- the application usually need not look at
     * these fields.  Note that the decompressor output side may not use
     * any parameters that can change between scans.
     */

    /* Quantization and Huffman tables are carried forward across input
     * datastreams when processing abbreviated JPEG datastreams.
     */

    JQUANT_TBL *quant_tbl_ptrs[NUM_QUANT_TBLS];
    /* ptrs to coefficient quantization tables, or NULL if not defined */

    JHUFF_TBL *dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
    JHUFF_TBL *ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
    /* ptrs to Huffman coding tables, or NULL if not defined */

    /* These parameters are never carried across datastreams, since they
     * are given in SOF/SOS markers or defined to be reset by SOI.
     */

    int data_precision;
    /* bits of precision in image data */

    jpeg_component_info *comp_info;
    /* comp_info[i] describes component that appears i'th in SOF */

#if JPEG_LIB_VERSION >= 80
    boolean is_baseline;		/* TRUE if Baseline SOF0 encountered */
#endif
#ifdef ANDROID
    boolean tile_decode;          /* TRUE if using tile based decoding */
#endif
    boolean progressive_mode;
    /* TRUE if SOFn specifies progressive mode */
    boolean arith_code;
    /* TRUE=arithmetic coding, FALSE=Huffman */

    UINT8 arith_dc_L[NUM_ARITH_TBLS];
    /* L values for DC arith-coding tables */
    UINT8 arith_dc_U[NUM_ARITH_TBLS];
    /* U values for DC arith-coding tables */
    UINT8 arith_ac_K[NUM_ARITH_TBLS];
    /* Kx values for AC arith-coding tables */

    unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */

    /* These fields record data obtained from optional markers recognized by
     * the JPEG library.
     */
    boolean saw_JFIF_marker;    /* TRUE iff a JFIF APP0 marker was found */
    /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
    UINT8 JFIF_major_version;
    /* JFIF version number */
    UINT8 JFIF_minor_version;
    UINT8 density_unit;
    /* JFIF code for pixel size units */
    UINT16 X_density;
    /* Horizontal pixel density */
    UINT16 Y_density;
    /* Vertical pixel density */
    boolean saw_Adobe_marker;
    /* TRUE iff an Adobe APP14 marker was found */
    UINT8 Adobe_transform;
    /* Color transform code from Adobe marker */

    boolean CCIR601_sampling;    /* TRUE=first samples are cosited */

    /* Aside from the specific data retained from APPn markers known to the
     * library, the uninterpreted contents of any or all APPn and COM markers
     * can be saved in a list for examination by the application.
     */
    jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */

    /* Remaining fields are known throughout decompressor, but generally
     * should not be touched by a surrounding application.
     */

    /*
     * These fields are computed during decompression startup
     */
    int max_h_samp_factor;
    /* largest h_samp_factor */
    int max_v_samp_factor;    /* largest v_samp_factor */

#if JPEG_LIB_VERSION >= 70
    int min_DCT_h_scaled_size;	/* smallest DCT_h_scaled_size of any component */
    int min_DCT_v_scaled_size;	/* smallest DCT_v_scaled_size of any component */
#else
    int min_DCT_scaled_size;    /* smallest DCT_scaled_size of any component */
#endif

    JDIMENSION total_iMCU_rows;    /* # of iMCU rows in image */
    /* The coefficient controller's input and output progress is measured in
     * units of "iMCU" (interleaved MCU) rows.  These are the same as MCU rows
     * in fully interleaved JPEG scans, but are used whether the scan is
     * interleaved or not.  We define an iMCU row as v_samp_factor DCT block
     * rows of each component.  Therefore, the IDCT output contains
     * v_samp_factor*DCT_[v_]scaled_size sample rows of a component per iMCU row.
     */

    JSAMPLE *sample_range_limit; /* table for fast range-limiting */

    /*
     * These fields are valid during any one scan.
     * They describe the components and MCUs actually appearing in the scan.
     * Note that the decompressor output side must not use these fields.
     */
    int comps_in_scan;
    /* # of JPEG components in this scan */
    jpeg_component_info *cur_comp_info[MAX_COMPS_IN_SCAN];
    /* *cur_comp_info[i] describes component that appears i'th in SOS */

    JDIMENSION MCUs_per_row;
    /* # of MCUs across the image */
    JDIMENSION MCU_rows_in_scan;
    /* # of MCU rows in the image */

    int blocks_in_MCU;
    /* # of DCT blocks per MCU */
    int MCU_membership[D_MAX_BLOCKS_IN_MCU];
    /* MCU_membership[i] is index in cur_comp_info of component owning */
    /* i'th block in an MCU */

    int Ss, Se, Ah, Al;        /* progressive JPEG parameters for scan */

#if JPEG_LIB_VERSION >= 80
    /* These fields are derived from Se of first SOS marker.
     */
    int block_size;		/* the basic DCT block size: 1..16 */
    const int * natural_order; /* natural-order position array for entropy decode */
    int lim_Se;			/* min( Se, DCTSIZE2-1 ) for entropy decode */
#endif

    /* This field is shared between entropy decoder and marker parser.
     * It is either zero or the code of a JPEG marker that has been
     * read from the data source, but has not yet been processed.
     */
    int unread_marker;

    /*
     * Links to decompression subobjects (methods, private variables of modules)
     */
    struct jpeg_decomp_master *master;
    struct jpeg_d_main_controller *main;
    struct jpeg_d_coef_controller *coef;
    struct jpeg_d_post_controller *post;
    struct jpeg_input_controller *inputctl;
    struct jpeg_marker_reader *marker;
    struct jpeg_entropy_decoder *entropy;
    struct jpeg_inverse_dct *idct;
    struct jpeg_upsampler *upsample;
    struct jpeg_color_deconverter *cconvert;
    struct jpeg_color_quantizer *cquantize;
};


typedef struct {

    // |--- byte_offset ---|- bit_left -|
    //  \------ 27 -------/ \---- 5 ----/
    unsigned int bitstream_offset;
    short prev_dc[3];

    // remaining EOBs in EOBRUN
    unsigned short EOBRUN;

    // save the decoder current bit buffer, entropy->bitstate.get_buffer.
    INT32 get_buffer;

    // save the restart info.
    unsigned short restarts_to_go;
    unsigned char next_restart_num;
} huffman_offset_data;

typedef struct {

    // The header starting position of this scan
    unsigned int bitstream_offset;

    // Number of components in this scan
    int comps_in_scan;

    // Number of MCUs in each row
    int MCUs_per_row;
    int MCU_rows_per_iMCU_row;

    // The last MCU position and its dc value in this scan
    huffman_offset_data prev_MCU_offset;

    huffman_offset_data **offset;
} huffman_scan_header;

#define DEFAULT_MCU_SAMPLE_SIZE 16

typedef struct {

    // The number of MCUs that we sample each time as an index point
    int MCU_sample_size;

    // Number of scan in this image
    int scan_count;

    // Number of iMCUs rows in this image
    int total_iMCU_rows;

    // Memory used by scan struct
    size_t mem_used;
    huffman_scan_header *scan;
} huffman_index;


/* "Object" declarations for JPEG modules that may be supplied or called
 * directly by the surrounding application.
 * As with all objects in the JPEG library, these structs only define the
 * publicly visible methods and state variables of a module.  Additional
 * private fields may exist after the public ones.
 */


/* Error handler object */

struct jpeg_error_mgr {
    /* Error exit handler: does not return to caller */
    JMETHOD(void, error_exit, (j_common_ptr
            cinfo));
    /* Conditionally emit a trace or warning message */
    JMETHOD(void, emit_message, (j_common_ptr
            cinfo,
            int msg_level));
    /* Routine that actually outputs a trace or error message */
    JMETHOD(void, output_message, (j_common_ptr
            cinfo));
    /* Format a message string for the most recent JPEG error or message */
    JMETHOD(void, format_message, (j_common_ptr
            cinfo,
            char *buffer));

#define JMSG_LENGTH_MAX  200    /* recommended size of format_message buffer */
    /* Reset error state variables at start of a new image */
    JMETHOD(void, reset_error_mgr, (j_common_ptr
            cinfo));

    /* The message ID code and any parameters are saved here.
     * A message can have one string parameter or up to 8 int parameters.
     */
    int msg_code;
#define JMSG_STR_PARM_MAX  80
    union {
        int i[8];
        char s[JMSG_STR_PARM_MAX];
    } msg_parm;

    /* Standard state variables for error facility */

    int trace_level;        /* max msg_level that will be displayed */

    /* For recoverable corrupt-data errors, we emit a warning message,
     * but keep going unless emit_message chooses to abort.  emit_message
     * should count warnings in num_warnings.  The surrounding application
     * can check for bad data by seeing if num_warnings is nonzero at the
     * end of processing.
     */
    long num_warnings;        /* number of corrupt-data warnings */

    /* These fields point to the table(s) of error message strings.
     * An application can change the table pointer to switch to a different
     * message list (typically, to change the language in which errors are
     * reported).  Some applications may wish to add additional error codes
     * that will be handled by the JPEG library error mechanism; the second
     * table pointer is used for this purpose.
     *
     * First table includes all errors generated by JPEG library itself.
     * Error code 0 is reserved for a "no such error string" message.
     */
    const char *const *jpeg_message_table;
    /* Library errors */
    int last_jpeg_message;    /* Table contains strings 0..last_jpeg_message */
    /* Second table can be added by application (see cjpeg/djpeg for example).
     * It contains strings numbered first_addon_message..last_addon_message.
     */
    const char *const *addon_message_table;
    /* Non-library errors */
    int first_addon_message;
    /* code for first string in addon table */
    int last_addon_message;    /* code for last string in addon table */
};


/* Progress monitor object */

struct jpeg_progress_mgr {
    JMETHOD(void, progress_monitor, (j_common_ptr
            cinfo));

    long pass_counter;
    /* work units completed in this pass */
    long pass_limit;
    /* total number of work units in this pass */
    int completed_passes;
    /* passes completed so far */
    int total_passes;        /* total number of passes expected */
};


/* Data destination object for compression */

struct jpeg_destination_mgr {
    JOCTET *next_output_byte;
    /* => next byte to write in buffer */
    size_t free_in_buffer;    /* # of byte spaces remaining in buffer */

    JMETHOD(void, init_destination, (j_compress_ptr
            cinfo));

    JMETHOD(boolean, empty_output_buffer, (j_compress_ptr
            cinfo));

    JMETHOD(void, term_destination, (j_compress_ptr
            cinfo));
};


/* Data source object for decompression */

struct jpeg_source_mgr {
    const JOCTET *next_input_byte;
    /* => next byte to read from buffer */
    size_t bytes_in_buffer;    /* # of bytes remaining in buffer */
#ifdef ANDROID
    const JOCTET *start_input_byte;
    /* => first byte to read from input */
    size_t current_offset; /* current readed input offset */
#endif

    JMETHOD(void, init_source, (j_decompress_ptr
            cinfo));

    JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr
            cinfo));

    JMETHOD(void, skip_input_data, (j_decompress_ptr
            cinfo,
            long num_bytes));

    JMETHOD(boolean, resync_to_restart, (j_decompress_ptr
            cinfo,
            int desired));

    JMETHOD(void, term_source, (j_decompress_ptr
            cinfo));

#ifdef ANDROID

    JMETHOD(boolean, seek_input_data, (j_decompress_ptr
            cinfo,
            long byte_offset));

#endif
};


/* Memory manager object.
 * Allocates "small" objects (a few K total), "large" objects (tens of K),
 * and "really big" objects (virtual arrays with backing store if needed).
 * The memory manager does not allow individual objects to be freed; rather,
 * each created object is assigned to a pool, and whole pools can be freed
 * at once.  This is faster and more convenient than remembering exactly what
 * to free, especially where malloc()/free() are not too speedy.
 * NB: alloc routines never return NULL.  They exit to error_exit if not
 * successful.
 */

#define JPOOL_PERMANENT    0    /* lasts until master record is destroyed */
#define JPOOL_IMAGE    1    /* lasts until done with image/datastream */
#define JPOOL_NUMPOOLS    2

typedef struct jvirt_sarray_control *jvirt_sarray_ptr;
typedef struct jvirt_barray_control *jvirt_barray_ptr;


struct jpeg_memory_mgr {
    /* Method pointers */
    JMETHOD(void *, alloc_small, (j_common_ptr
            cinfo,
            int pool_id,
            size_t sizeofobject));

    JMETHOD(void FAR
                    *, alloc_large, (j_common_ptr
                    cinfo,
                    int pool_id,
                    size_t sizeofobject));

    JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr
            cinfo,
            int pool_id,
            JDIMENSION samplesperrow,
            JDIMENSION numrows));

    JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr
            cinfo,
            int pool_id,
            JDIMENSION blocksperrow,
            JDIMENSION numrows));

    JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr
            cinfo,
            int pool_id,
            boolean pre_zero,
            JDIMENSION samplesperrow,
            JDIMENSION numrows,
            JDIMENSION maxaccess));

    JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr
            cinfo,
            int pool_id,
            boolean pre_zero,
            JDIMENSION blocksperrow,
            JDIMENSION numrows,
            JDIMENSION maxaccess));

    JMETHOD(void, realize_virt_arrays, (j_common_ptr
            cinfo));

    JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr
            cinfo,
                    jvirt_sarray_ptr
            ptr,
                    JDIMENSION
            start_row,
                    JDIMENSION
            num_rows,
                    boolean
            writable));

    JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr
            cinfo,
                    jvirt_barray_ptr
            ptr,
                    JDIMENSION
            start_row,
                    JDIMENSION
            num_rows,
                    boolean
            writable));

    JMETHOD(void, free_pool, (j_common_ptr
            cinfo,
            int pool_id));

    JMETHOD(void, self_destruct, (j_common_ptr
            cinfo));

    /* Limit on memory allocation for this JPEG object.  (Note that this is
     * merely advisory, not a guaranteed maximum; it only affects the space
     * used for virtual-array buffers.)  May be changed by outer application
     * after creating the JPEG object.
     */
    long max_memory_to_use;

    /* Maximum allocation request accepted by alloc_large. */
    long max_alloc_chunk;
};


/* Routine signature for application-supplied marker processing methods.
 * Need not pass marker code since it is stored in cinfo->unread_marker.
 */
typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr
        cinfo));


/* Declarations for routines called by application.
 * The JPP macro hides prototype parameters from compilers that can't cope.
 * Note JPP requires double parentheses.
 */

#ifdef HAVE_PROTOTYPES
#define JPP(arglist)    arglist
#else
#define JPP(arglist)	()
#endif


/* Short forms of external names for systems with brain-damaged linkers.
 * We shorten external names to be unique in the first six letters, which
 * is good enough for all known systems.
 * (If your compiler itself needs names to be unique in less than 15 
 * characters, you are out of luck.  Get a better compiler.)
 */

#ifdef NEED_SHORT_EXTERNAL_NAMES
#define jpeg_std_error		jStdError
#define jpeg_CreateCompress	jCreaCompress
#define jpeg_CreateDecompress	jCreaDecompress
#define jpeg_destroy_compress	jDestCompress
#define jpeg_destroy_decompress	jDestDecompress
#define jpeg_stdio_dest		jStdDest
#define jpeg_stdio_src		jStdSrc
#if JPEG_LIB_VERSION >= 80
#define jpeg_mem_dest		jMemDest
#define jpeg_mem_src		jMemSrc
#endif
#define jpeg_set_defaults	jSetDefaults
#define jpeg_set_colorspace	jSetColorspace
#define jpeg_default_colorspace	jDefColorspace
#define jpeg_set_quality	jSetQuality
#define jpeg_set_linear_quality	jSetLQuality
#if JPEG_LIB_VERSION >= 70
#define jpeg_default_qtables	jDefQTables
#endif
#define jpeg_add_quant_table	jAddQuantTable
#define jpeg_quality_scaling	jQualityScaling
#define jpeg_simple_progression	jSimProgress
#define jpeg_suppress_tables	jSuppressTables
#define jpeg_alloc_quant_table	jAlcQTable
#define jpeg_alloc_huff_table	jAlcHTable
#define jpeg_start_compress	jStrtCompress
#define jpeg_write_scanlines	jWrtScanlines
#define jpeg_finish_compress	jFinCompress
#if JPEG_LIB_VERSION >= 70
#define jpeg_calc_jpeg_dimensions	jCjpegDimensions
#endif
#define jpeg_write_raw_data	jWrtRawData
#define jpeg_write_marker	jWrtMarker
#define jpeg_write_m_header	jWrtMHeader
#define jpeg_write_m_byte	jWrtMByte
#define jpeg_write_tables	jWrtTables
#define jpeg_read_header	jReadHeader
#define jpeg_start_decompress	jStrtDecompress
#define jpeg_read_scanlines	jReadScanlines
#define jpeg_finish_decompress	jFinDecompress
#define jpeg_read_raw_data	jReadRawData
#define jpeg_has_multiple_scans	jHasMultScn
#define jpeg_start_output	jStrtOutput
#define jpeg_finish_output	jFinOutput
#define jpeg_input_complete	jInComplete
#define jpeg_new_colormap	jNewCMap
#define jpeg_consume_input	jConsumeInput
#if JPEG_LIB_VERSION >= 80
#define jpeg_core_output_dimensions	jCoreDimensions
#endif
#define jpeg_calc_output_dimensions	jCalcDimensions
#define jpeg_save_markers	jSaveMarkers
#define jpeg_set_marker_processor	jSetMarker
#define jpeg_read_coefficients	jReadCoefs
#define jpeg_write_coefficients	jWrtCoefs
#define jpeg_copy_critical_parameters	jCopyCrit
#define jpeg_abort_compress	jAbrtCompress
#define jpeg_abort_decompress	jAbrtDecompress
#define jpeg_abort		jAbort
#define jpeg_destroy		jDestroy
#define jpeg_resync_to_restart	jResyncRestart
#endif /* NEED_SHORT_EXTERNAL_NAMES */


/* Default error-management setup */
EXTERN(struct jpeg_error_mgr *)jpeg_std_error
        JPP((struct jpeg_error_mgr * err));

/* Initialization of JPEG compression objects.
 * jpeg_create_compress() and jpeg_create_decompress() are the exported
 * names that applications should call.  These expand to calls on
 * jpeg_CreateCompress and jpeg_CreateDecompress with additional information
 * passed for version mismatch checking.
 * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
 */
#define jpeg_create_compress(cinfo) \
    jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
            (size_t) sizeof(struct jpeg_compress_struct))
#define jpeg_create_decompress(cinfo) \
    jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
              (size_t) sizeof(struct jpeg_decompress_struct))

EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr
                                             cinfo,
                                             int version, size_t
                                             structsize));

EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr
                                               cinfo,
                                               int version, size_t
                                               structsize));
/* Destruction of JPEG compression objects */
EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr
                                               cinfo));

EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr
                                                 cinfo));

/* Standard data source and destination managers: stdio streams. */
/* Caller is responsible for opening the file before and closing after. */
EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr
                                         cinfo, FILE * outfile));

EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr
                                        cinfo, FILE * infile));

#if JPEG_LIB_VERSION >= 80
/* Data source and destination managers: memory buffers. */
EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo,
                   unsigned char ** outbuffer,
                   unsigned long * outsize));
EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo,
                  unsigned char * inbuffer,
                  unsigned long insize));
#endif

/* Default parameter setup for compression */
EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr
                                           cinfo));
/* Compression parameter setup aids */
EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr
                                             cinfo,
                                                     J_COLOR_SPACE
                                             colorspace));

EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr
                                                 cinfo));

EXTERN(void) jpeg_set_quality JPP((j_compress_ptr
                                          cinfo,
                                          int quality,
                                          boolean force_baseline));

EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr
                                                 cinfo,
                                                 int scale_factor,
                                                 boolean force_baseline));

#if JPEG_LIB_VERSION >= 70
EXTERN(void) jpeg_default_qtables JPP((j_compress_ptr cinfo,
                       boolean force_baseline));
#endif

EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr
                                              cinfo,
                                              int which_tbl,
                                              const unsigned int *basic_table,
                                              int scale_factor,
                                              boolean force_baseline));

EXTERN(int) jpeg_quality_scaling JPP((int quality));

EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr
                                                 cinfo));

EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr
                                              cinfo,
                                                      boolean
                                              suppress));

EXTERN(JQUANT_TBL *)jpeg_alloc_quant_table JPP((j_common_ptr
                                                       cinfo));

EXTERN(JHUFF_TBL *)jpeg_alloc_huff_table JPP((j_common_ptr
                                                     cinfo));

/* Main entry points for compression */
EXTERN(void) jpeg_start_compress JPP((j_compress_ptr
                                             cinfo,
                                                     boolean
                                             write_all_tables));

EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr
                                                    cinfo,
                                                            JSAMPARRAY
                                                    scanlines,
                                                            JDIMENSION
                                                    num_lines));

EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr
                                              cinfo));

#if JPEG_LIB_VERSION >= 70
/* Precalculate JPEG dimensions for current compression parameters. */
EXTERN(void) jpeg_calc_jpeg_dimensions JPP((j_compress_ptr cinfo));
#endif

/* Replaces jpeg_write_scanlines when writing raw downsampled data. */
EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr
                                                   cinfo,
                                                           JSAMPIMAGE
                                                   data,
                                                           JDIMENSION
                                                   num_lines));

/* Write a special marker.  See libjpeg.txt concerning safe usage. */
EXTERN(void) jpeg_write_marker
        JPP((j_compress_ptr
                    cinfo,
                    int marker,
                    const JOCTET *dataptr,
                    unsigned int datalen));
/* Same, but piecemeal. */
EXTERN(void) jpeg_write_m_header
        JPP((j_compress_ptr
                    cinfo,
                    int marker,
                    unsigned int datalen));

EXTERN(void) jpeg_write_m_byte
        JPP((j_compress_ptr
                    cinfo,
                    int val));

/* Alternate compression function: just write an abbreviated table file */
EXTERN(void) jpeg_write_tables JPP((j_compress_ptr
                                           cinfo));

/* Decompression startup: read start of JPEG datastream to see what's there */
EXTERN(int) jpeg_read_header JPP((j_decompress_ptr
                                         cinfo,
                                                 boolean
                                         require_image));
/* Return value is one of: */
#define JPEG_SUSPENDED        0 /* Suspended due to lack of input data */
#define JPEG_HEADER_OK        1 /* Found valid image datastream */
#define JPEG_HEADER_TABLES_ONLY    2 /* Found valid table-specs-only datastream */
/* If you pass require_image = TRUE (normal case), you need not check for
 * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
 * JPEG_SUSPENDED is only possible if you use a data source module that can
 * give a suspension return (the stdio source module doesn't).
 */

/* Main entry points for decompression */
EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr
                                                  cinfo));

#ifdef ANDROID

EXTERN(boolean) jpeg_start_tile_decompress JPP((j_decompress_ptr
                                                       cinfo));

#endif

EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr
                                                   cinfo,
                                                           JSAMPARRAY
                                                   scanlines,
                                                           JDIMENSION
                                                   max_lines));

EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr
                                                   cinfo));

/* Replaces jpeg_read_scanlines when reading raw downsampled data. */
EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr
                                                  cinfo,
                                                          JSAMPIMAGE
                                                  data,
                                                          JDIMENSION
                                                  max_lines));

#ifdef ANDROID

EXTERN(JDIMENSION) jpeg_read_scanlines_from JPP((j_decompress_ptr
                                                        cinfo,
                                                                JSAMPARRAY
                                                        scanlines,
                                                        int line_offset,
                                                        JDIMENSION max_lines));

EXTERN(JDIMENSION) jpeg_read_tile_scanline JPP((j_decompress_ptr
                                                       cinfo,
                                                               huffman_index * index,
                                                               JSAMPARRAY
                                                       scanlines));

EXTERN(void) jpeg_init_read_tile_scanline JPP((j_decompress_ptr
                                                      cinfo,
                                                              huffman_index * index,
                                                      int *start_x,
                                                      int *start_y,
                                                      int *width,
                                                      int *height));

#endif

/* Additional entry points for buffered-image mode. */
EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr
                                                    cinfo));

EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr
                                              cinfo,
                                              int scan_number));

EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr
                                               cinfo));

EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr
                                                cinfo));

EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr
                                           cinfo));

EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr
                                           cinfo));
/* Return value is one of: */
/* #define JPEG_SUSPENDED	0    Suspended due to lack of input data */
#define JPEG_REACHED_SOS    1 /* Reached start of new scan */
#define JPEG_REACHED_EOI    2 /* Reached end of image */
#define JPEG_ROW_COMPLETED    3 /* Completed one iMCU row */
#define JPEG_SCAN_COMPLETED    4 /* Completed last iMCU row of a scan */

/* Precalculate output dimensions for current decompression parameters. */
#if JPEG_LIB_VERSION >= 80
EXTERN(void) jpeg_core_output_dimensions JPP((j_decompress_ptr cinfo));
#endif

EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr
                                                     cinfo));

/* Control saving of COM and APPn markers into marker_list. */
EXTERN(void) jpeg_save_markers
        JPP((j_decompress_ptr
                    cinfo,
                    int marker_code,
                    unsigned int length_limit));

/* Install a special processing method for COM or APPn markers. */
EXTERN(void) jpeg_set_marker_processor
        JPP((j_decompress_ptr
                    cinfo,
                    int marker_code,
                    jpeg_marker_parser_method routine));

/* Read or write raw DCT coefficients --- useful for lossless transcoding. */
EXTERN(jvirt_barray_ptr *)jpeg_read_coefficients JPP((j_decompress_ptr
                                                             cinfo));

EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr
                                                 cinfo,
                                                         jvirt_barray_ptr * coef_arrays));

EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr
                                                       srcinfo,
                                                               j_compress_ptr
                                                       dstinfo));

/* If you choose to abort compression or decompression before completing
 * jpeg_finish_(de)compress, then you need to clean up to release memory,
 * temporary files, etc.  You can just call jpeg_destroy_(de)compress
 * if you're done with the JPEG object, but if you want to clean it up and
 * reuse it, call this:
 */
EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr
                                             cinfo));

EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr
                                               cinfo));

/* Generic versions of jpeg_abort and jpeg_destroy that work on either
 * flavor of JPEG object.  These may be more convenient in some places.
 */
EXTERN(void) jpeg_abort JPP((j_common_ptr
                                    cinfo));

EXTERN(void) jpeg_destroy JPP((j_common_ptr
                                      cinfo));

/* Default restart-marker-resync procedure for use by data source modules */
EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr
                                                   cinfo,
                                                   int desired));

#ifdef ANDROID

EXTERN(boolean) jpeg_build_huffman_index
        JPP((j_decompress_ptr
                    cinfo, huffman_index * index));

EXTERN(void) jpeg_configure_huffman_decoder(j_decompress_ptr cinfo,
                                            huffman_offset_data offset);

EXTERN(void) jpeg_get_huffman_decoder_configuration(j_decompress_ptr cinfo,
                                                    huffman_offset_data *offset);

EXTERN(void) jpeg_create_huffman_index(j_decompress_ptr cinfo,
                                       huffman_index *index);

EXTERN(void) jpeg_configure_huffman_index_scan(j_decompress_ptr cinfo,
                                               huffman_index *index, int scan_no, int offset);

EXTERN(void) jpeg_destroy_huffman_index(huffman_index *index);

#endif

/* These marker codes are exported since applications and data source modules
 * are likely to want to use them.
 */

#define JPEG_RST0    0xD0    /* RST0 marker code */
#define JPEG_EOI    0xD9    /* EOI marker code */
#define JPEG_APP0    0xE0    /* APP0 marker code */
#define JPEG_COM    0xFE    /* COM marker code */


/* If we have a brain-damaged compiler that emits warnings (or worse, errors)
 * for structure definitions that are never filled in, keep it quiet by
 * supplying dummy definitions for the various substructures.
 */

#ifdef INCOMPLETE_TYPES_BROKEN
#ifndef JPEG_INTERNALS		/* will be defined in jpegint.h */
struct jvirt_sarray_control { long dummy; };
struct jvirt_barray_control { long dummy; };
struct jpeg_comp_master { long dummy; };
struct jpeg_c_main_controller { long dummy; };
struct jpeg_c_prep_controller { long dummy; };
struct jpeg_c_coef_controller { long dummy; };
struct jpeg_marker_writer { long dummy; };
struct jpeg_color_converter { long dummy; };
struct jpeg_downsampler { long dummy; };
struct jpeg_forward_dct { long dummy; };
struct jpeg_entropy_encoder { long dummy; };
struct jpeg_decomp_master { long dummy; };
struct jpeg_d_main_controller { long dummy; };
struct jpeg_d_coef_controller { long dummy; };
struct jpeg_d_post_controller { long dummy; };
struct jpeg_input_controller { long dummy; };
struct jpeg_marker_reader { long dummy; };
struct jpeg_entropy_decoder { long dummy; };
struct jpeg_inverse_dct { long dummy; };
struct jpeg_upsampler { long dummy; };
struct jpeg_color_deconverter { long dummy; };
struct jpeg_color_quantizer { long dummy; };
#endif /* JPEG_INTERNALS */
#endif /* INCOMPLETE_TYPES_BROKEN */


/*
 * The JPEG library modules define JPEG_INTERNALS before including this file.
 * The internal structure declarations are read only when that is true.
 * Applications using the library should not include jpegint.h, but may wish
 * to include jerror.h.
 */

#ifdef JPEG_INTERNALS
#include "jpegint.h"		/* fetch private declarations */
#include "jerror.h"		/* fetch error codes too */
#endif

#ifndef ANDROID
#ifdef __cplusplus
#ifndef DONT_USE_EXTERN_C
}
#endif
#endif
#endif

#endif /* JPEGLIB_H */
